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You are here: Home / Articles / Study Implicates Epstein-Barr Virus in 7 Autoimmune Diseases

Study Implicates Epstein-Barr Virus in 7 Autoimmune Diseases

October 18, 2019 • By Mary Beth Nierengarten

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Kateryna Kon / shutterstock.com

Kateryna Kon / shutterstock.com

The identification of specific transcription factors linked to the Epstein-Barr virus (EBV) provides new information on the molecular mechanisms underlying the link between EBV and autoimmune disease.

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A recently published study, “Transcrip­tion Factors Operate Across Disease Loci, with EBNA2 Implicated in Auto­immunity,” co-led by John B. Harley, MD, PhD; Leah C. Kottyan, PhD; and Matthew T. Weirauch, PhD, at the Center for Autoimmune Genomics and Etiology, Cincinnati Children’s Hospital Medical Center, Ohio, found EBNA2, a protein produced by Epstein-Barr, binds to several locations along the human genome—locations that are associated with seven autoimmune diseases: systemic lupus erythematosus (SLE), multiple sclerosis, rheumatoid arthritis (RA), juvenile idiopathic arthritis, inflammatory bowel disease, celiac disease and type 1 diabetes.1

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Dr. Harley, director of the Center for Autoimmune Genomics and Etiology and professor of pediatrics and medicine at the University of Cincinnati, where he holds the David Glass Endowed Chair, says this finding is consistent with the possibility the Epstein-Barr virus causes these seven autoimmune diseases for at least some patients with these diseases.

“There were strong hints [of this] previously,” he says, “but the extent of the relationship was not known.”

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“The link between EBV and auto­immunity has been suspected but remains controversial,” says Peter A. Nigrovic, MD, associate professor of medicine at Harvard Medical School, director of the Center for Adults with Pediatric Rheumatic Illness and director of the Joint Biology Consortium of Boston Children’s Hospital and Brigham and Women’s Hospital, Boston, commenting on the study. “This study integrates a vast amount of data to identify a genetic explanation for the connection. By pro­viding a candidate mechanism, Harley and colleagues help render the epidemiologic evidence behind the association between EBV and autoimmunity more readily comprehensible.”

Uncovering Molecular Mechanisms

In the study, investigators developed and used two novel informatics tools. As explained in an article by Dr. Weirauch, a computational biologist, one of the tools is a new computational method for discovering disease-driving mechanisms.2 Called the Regulatory Element Locus Intersector, the method is an algorithm that estimates the significance of the intersection between disease-causing variants and DNA sequence. This tool allowed investigators to identify particular proteins occupying disease risk loci. Once these proteins were identified, the investigators used the second novel tool, the Measurement of Allelic Ratios Informatics Operator (MARIO), to provide insight into the molecular mechanisms of disease. Using MARIO, the investigators were able to show examples of a possible genetic role for the transcription factors linked to various diseases, Dr. Weirauch states in the article.

By using these tools, the investigators were able to show that transcription factors and cofactors are often concentrated in the risk loci of diseases and physiological phenotypes are frequently expected by chance, according to Dr. Harley.

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Specifically, the study identified 2,264 relationships be­tween hundreds of transcription factors and 94 phenotypes. For example, the study found the Epstein-Barr virus EBNA2 protein and many clustering human transcription factors occupy nearly half of systemic lupus erythematosus risk loci. The EBNA2 protein and clustering human transcription factors also occupy multiple other auto­immune diseases, including rheumatoid arthritis, multiple sclerosis, type 1 diabetes, juvenile idiopathic arthritis, inflammatory bowel disease and celiac disease. Overall, this association with EBNA2 and these autoimmune diseases demonstrates a gene-environment interaction of these diseases.

“The study by Dr. Harley and colleagues indicates the genes targeted by EBV are disproportionately ones that alter risk of autoimmune diseases, including lupus and rheumatoid arthritis,” says Dr. Nigrovic. “This finding, therefore, provides a new mechanistic link between EBV infection and autoimmune diseases.”

Some of the results for systemic lupus erythematosus from the recent study published in Nature Genetics are presented in Figure 1.

Pages: 1 2 3 | Single Page

Filed Under: Conditions, Research Reviews Tagged With: Epstein-Barr virus (EBV)Issue: October 2019

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